/*
 * Copyright 2014-2020 Netflix, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.netflix.atlas.poller

import java.util.concurrent.atomic.AtomicReference

import scala.concurrent.Future
import scala.concurrent.Promise
import scala.util.Failure
import scala.util.Success
import scala.util.Try

class DataRef {

  private val sendMsg = new AtomicReference[Try[Any]](Failure(new RuntimeException("not set")))
  private var recvPromise: Promise[AnyRef] = Promise()

  def set(msg: Try[Any]): Unit = sendMsg.set(msg)

  def get: Try[Any] = sendMsg.get()

  def receive(v: AnyRef): Unit = recvPromise.complete(Success(v))

  def complete(): Unit = {
    if (!recvPromise.isCompleted) recvPromise.complete(Failure(new RuntimeException("done")))
  }

  def reset(): Unit = {
    recvPromise = Promise()
  }

  def future: Future[AnyRef] = recvPromise.future
}
